sounds like a loud an clear “don’t use them - return them and get others!”

I did a quick research for available drivers or plugins for other smarthome frameworks. Apparently the plug isn’t supported elsewhere.

If you are ready to tinker with the firmware of the OBI Smart Plug, this provides a cheap alternative. Another possibility may be the SonOff S20 plug. Another, but more expensive OOTB alternative is TP-Link HS110 with energy metering which is currently available for 30 Euros.

"It always takes longer than you expect, even when you take into account Hofstadter's Law.", Hofstadter's Law